The Millennium Cohort Study is a Department of Defense longitudinal research project aimed at determining how military-related experiences affect long term health of Service members to define healthcare policies and guide prevention and treatment programs for future generations of military personnel.
Chesbrough, K. B., Ryan, M. A., Amoroso, P., Boyko, E. J., Gackstetter, G. D., Hooper, T. I., ... & Millennium Cohort Study Group. (2002). The Millennium Cohort Study: a 21-year prospective cohort study of 140,000 military personnel. Military medicine, 167(6), 483-488. https://doi.org/10.1093/milmed/167.6.483